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Video Scaler v4.0 User Guide
UG805 March 1, 2011
Chapter 8:
Coefficients
If the user specifies in the CORE Generator or EDK GUI that the Luma and Chroma filters
share common coefficients, then there is no coefficient memory space available for chroma
coefficients. In this case, the user must not load chroma coefficients using the Coefficient
interface, and must not specify chroma coefficients in the .coe file.
Similarly, if the user has specified in the CORE Generator or EDK GUI that the Horizontal
and Vertical filters share common coefficients, then there is no coefficient memory space
available for Vertical coefficients. In this case, the user must not load Vertical coefficients
using the Coefficient interface, and must not specify Vertical coefficients in the .coe file.
Note:
This option is only available if the number of horizontal taps is equal to the number of vertical
taps.
Coefficient Interface
The scaler uses only one set of coefficients per frame period. To change to a different set of
stored coefficients for the next frame, use the
h_coeff_set
and
v_coeff_set
dynamic
register inputs.
You may load new coefficients into a different location in the coefficient store during some
frame period
before
they are required. You may load a maximum of
one
coefficient set
(including all of HY, HC, VY, VC components) per frame period. Subsequently, this
coefficient set may be selected for use by controlling
h_coeff_set
and
v_coeff_set
.
Filter Coefficients may be loaded into the coefficient memory using the coefficient memory
interface. This comprises:
The 32-bit input word always holds two coefficients. The scaler supports 16-bit coefficient
bit-widths. The word format is shown in
Figure 8-1
.
coef_data_in(31:0)
32-bit coefficient input bus
coef_wr_en
Coefficient write-enable
coef_set_wr_addr(3:0)
Coefficient set write address
X-Ref Target - Figure 8-1
Figure 8-1:
Coefficient Write-Format on coef_data_in(31:0)
3
1
15
0
V
a
lid - Coefficient n+1
V
a
lid - Coefficient n
16-
b
it Coefficient
s
UG_2
8
_0
3
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Summary of Contents for LogiCORE IP
Page 1: ...LogiCORE IP Video Scaler v4 0 User Guide UG805 March 1 2011...
Page 6: ...Video Scaler v4 0 User Guide www xilinx com UG805 March 1 2011...
Page 14: ...14 www xilinx com Video Scaler v4 0 User Guide UG805 March 1 2011 Preface About This Guide...
Page 18: ...18 www xilinx com Video Scaler v4 0 User Guide UG805 March 1 2011 Chapter 1 Introduction...
Page 20: ...20 www xilinx com Video Scaler v4 0 User Guide UG805 March 1 2011 Chapter 2 Overview...
Page 70: ...70 www xilinx com Video Scaler v4 0 User Guide UG805 March 1 2011 Chapter 9 Performance...
Page 74: ...74 www xilinx com Video Scaler v4 0 User Guide UG805 March 1 2011 Appendix A Use Cases...
Page 92: ...92 www xilinx com Video Scaler v4 0 User Guide UG805 March 1 2011 Appendix B Programmer Guide...
